#include <stdio.h>
void main()
{
    int a,i,m;
    printf("There are aollowing perfect numbers smaller than 1000:\n");
    for(a=1;a<1000;a++){
        for(m=0,i=1;i<=a/2;i++)
        if(! (a%i))m+=i;
        if(m==a)
        printf(" %4d",a);
    }
}